Major Deep Layer of Intrinsic TRANSVERSOSPINALES

Semispinalis

O: Transverse process of C4-T5

I: Between superior and inferior nuchal lines of occipital bone

N: posterior rami C1-L5

A: extend head and vertebral column

Multifidus

O:

• Sacrum (posterior)

• Transverse processes of L5-C2

I:

• Spinous processes of L5-C2

• 2-4 segments above origin

N: posterior rami C1-L5

A:

• Extends vertebral column

• Rotates vertebral column to opposite side

Rotatores Brevis

O: Transverse processes of cervical & lumbar vertebrae

I: Base of spinous process of vertebrae immediately above

N: posterior rami C1-L5

A:

• Extends vertebral column

• Rotates vertebral column to opposite side

Rotatores Longus

O: Transverse processes of cervical & lumbar vertebrae

I: Base of spinous process of vertebra 2 segments above

N: posterior rami C1-L5

A:

• Extends vertebral column

• Rotates vertebral column to opposite side